Operation and maintenance manual

i04112409
Electrical System
Never disconnect any charging unit circuit or battery
circuit cable from the battery when the charging unit
is operating. A spark can cause the combustible
gases that are produced by some batteries to ignite.
To help prevent sparks from igniting combustible
gases that are produced by some batteries, the
negative “−” cable should be connected last from the
external power source to the negative “−” terminal of
the starting motor. If the starting motor is not
equipped with a negative “−” terminal, connect the
cable to the engine block.
Check the electrical wires daily for wires that are
loose or frayed. Tighten all loose electrical
connections before the engine is started. Repair all
frayed electrical wires before the engine is started.
See the Operation and Maintenance Manual for
specific starting instructions.
Grounding Practices
Illustration 12 g02315896
Typical example
(1) Ground to battery
(2) Primary position for grounding
(3) Ground to engine block
(4) Ground to starting motor
Illustration 13 g02315900
Typical example
(5) Ground to battery
(6) Ground to engine block
(7) Primary position for grounding
Correct grounding for the engine electrical system is
necessary for optimum engine performance and
reliability. Incorrect grounding will result in
uncontrolled electrical circuit paths and in unreliable
electrical circuit paths.
Uncontrolled electrical circuit paths can result in
damage to engine components.
Engines that are installed without engine-to-frame
ground straps can be damaged by electrical
discharge.
To ensure the engine and the engine electrical
systems function correctly, an engine-to-frame
ground strap with a direct path to the battery must be
used. This path may be provided by way of a direct
engine ground to the frame.
The connections for the grounds should be tight and
free of corrosion. The engine alternator must be
grounded to the negative “-” battery terminal with a
wire adequate to handle the full charging current of
the alternator.
16
SEBU8726-03
Safety Section
Electrical System
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